Multi-character escape classes don't work correctly in regular expressions
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                 Key: XERCESC-1816
                 URL: https://issues.apache.org/jira/browse/XERCESC-1816
             Project: Xerces-C++
          Issue Type: Bug
          Components: Validating Parser (XML Schema)
    Affects Versions: 2.8.0, 3.0.0
            Reporter: John Snelson


The regular expressions "\i", "\I", "\c" and "\C" do not work as specified in 
the XML Schema specification:

http://www.w3.org/TR/xmlschema-2/#nt-MultiCharEsc

In fact, "\I" and "\C" cause an infinite loop during the parsing of the regular 
expression, "\i" seems to only match the letter "i", and "\c" gives the error:

A character in U+0040-U+005f must follow '\c'.

I'd be happy to attempt to fix this bug, but I need some guidance as to what 
the code for "\c" is actually meant to be doing.

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